8/24/12 11:48 AM EDT

Romney campaign adviser Russ Schriefer says the campaign is "still optimistic" that television networks will air primetime coverage of the GOP convention's opening night, despite the fact that they are not scheduled to do so and have given no inidication of changing course.

Ann Romney, the candidate's wife and one of his most popular surrogates, is scheduled to deliver the keynote speech Monday. But sources familiar with the scheduling plans told POLITICO this morning that the campaign is considering a move to Tuesday night because NBC, ABC, and CBS do not intend to provide primetime coverage of Monday night's proceedings. (Though all three networks will anchor their half-hour nightly news casts from the convention.)

"We're still optimistic that the networks are going to change their mind and cover Monday night," Schriefer said during a conference call with reporters Friday morning. "We understand only covering three nights, but what we find puzzling is why everyone has to cover the same three nights.”

Sources at multiple networks said it was highly unlikely that the networks would cover Monday night's proceedings, given the cost and last-minute planning it would require.

Mitt Romney is also scheduled to be nominated on Monday night by roll call, and Schrieffer told reporters that the campaign is planning to time the roll call so that it hits 1,144 delegates just as the broadcast networks begin their nightly news casts.